I’m wondering if the usb on the back is to connect camera to camera. I tried but didn’t work. Was I doing it wrong. I have to doubt myself first. Its safer for everyone.
You can use it for power to another camera (daisy chain) if the the USB charger and cable can support enough current for 2 cameras. I have used a 1 amp USB charger but it was marginal and sometimes one of the cameras would go off line. I found one that claimed to be a 2 amp charger and it worked much better.